Math - Carmella and Mariah got summer jobs at the ice cream shop and were supposed to work 15 hours

Carmella and Mariah got summer jobs at the ice cream shop and were supposed to work 15 hours per week each for 8 weeks. During that time, Mariah was ill for one week and Carmella took her shifts. How many hours did Carmella work during the 8 weeks? 

a. 120 hours 

b. 135 hours 

c. 150 hours 

d. 185 hours

Answer: b. 135 hours 

Carmella worked 15 hours per week for 8 weeks: 15 × 8 = 120. In addition, she worked 15 hours for Mariah for one week, so: 120 + 15 = 135.